CN111158062A - Human body existence detection method and system - Google Patents
Human body existence detection method and system Download PDFInfo
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- CN111158062A CN111158062A CN202010011594.1A CN202010011594A CN111158062A CN 111158062 A CN111158062 A CN 111158062A CN 202010011594 A CN202010011594 A CN 202010011594A CN 111158062 A CN111158062 A CN 111158062A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V9/00—Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00
- G01V9/005—Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00 by thermal methods, e.g. after generation of heat by chemical reactions
Abstract
The application discloses a human presence detection method, which comprises the following steps: when the pyroelectric infrared sensor is triggered, outputting a first interrupt signal to the infrared array thermal sensor; when the infrared array heat sensor detects a heat source signal meeting the human body condition within a first preset time, the infrared array heat sensor outputs a second interrupt signal to the main control circuit; and the radio frequency communication module of the main control circuit sends the person state information. Compared with the prior art, the method has the following beneficial effects: the device can detect dynamic and static human bodies, and can ensure that the power consumption of the whole machine is lower and the device is suitable for supplying power to disposable batteries (button lithium batteries, columnar lithium batteries, dry batteries and the like).
Description
Technical Field
The application relates to the technical field of sensing, in particular to a human body existence detection method.
Background
The PIR sensor (pyroelectric infrared sensor) is a passive infrared detector based on pyroelectric effect, and can realize detection of a moving human body by matching with a Fresnel lens. Due to the characteristics of low cost, low power consumption, high detection sensitivity, simple application and the like, the method is widely applied to a plurality of fields of security systems, illumination control, temperature measurement, energy-saving control and the like.
At present, a human body detection system based on a PIR sensor mainly has the following defects: (1) due to the characteristics of the pyroelectric effect, only a moving human body can be detected, and the human body which is still for a long time cannot be effectively sensed; (2) because the sensitivity is higher, the situation of generating false alarm is more common. Factors such as temperature jump and airflow disturbance caused by air conditioners, natural wind, sunlight and the like have higher probability of triggering false alarm.
Disclosure of Invention
The main object of the present application is to provide a human presence detection method, comprising:
when the pyroelectric infrared sensor is triggered, outputting a first interrupt signal to the infrared array thermal sensor;
when the infrared array heat sensor detects a heat source signal meeting the human body condition within a first preset time, the infrared array heat sensor outputs a second interrupt signal to the main control circuit;
and the radio frequency communication module of the main control circuit sends the person state information.
Optionally, when the infrared array thermal sensor does not detect the heat source signal within a first preset time, the infrared array thermal sensor does not output the second interrupt signal, and determines that the first interrupt signal is a false alarm signal.
Optionally, the radio frequency communication module of the main control circuit is turned off after sending the first state, and the infrared array thermal sensor continues to work.
Optionally, when the infrared array thermal sensor detects the heat source signal within a second preset time, repeating the above steps; and when the infrared array heat sensor does not detect the heat source signal within a second preset time, the infrared array heat sensor is closed.
Optionally, after the pyroelectric infrared sensor outputs the first interrupt signal, the method further includes:
the infrared array thermal sensor acquires initial frame temperature data;
marking coordinate information of the maximum temperature value of the current frame, calculating the temperature difference between the temperature value of the dot matrix taking the coordinate information as the center and the maximum temperature, wherein if the temperature difference is greater than a first preset temperature, the infrared array heat sensor does not output, and if the temperature difference is less than the first preset temperature, the infrared array heat sensor outputs a second interrupt signal.
Optionally, the acquiring initial frame temperature data by the infrared array thermal sensor comprises:
when a first difference value between the maximum value and the average value in the initial frame temperature data is smaller than a second preset temperature, the infrared array thermal sensor does not output; and when the first difference is greater than the second preset temperature, judging a second difference between the maximum value and the average value of the temperature data of the next continuous n frames, if the second difference is less than the second preset temperature, the infrared array thermal sensor has no output, and if the second difference is greater than the second preset temperature, entering the next judgment process, wherein n is a natural number.
According to an aspect of the present application, there is provided a human presence detection system, comprising:
the pyroelectric infrared sensor is used for outputting a first interrupt signal to the infrared array heat sensor when the pyroelectric infrared sensor is triggered;
the detection module is used for outputting a second interrupt signal to the main control circuit by the infrared array heat sensor when the infrared array heat sensor detects a heat source signal meeting human body conditions within first preset time;
and the communication module is used for sending the person state information by the radio frequency communication module of the main control circuit.
The application also discloses a computer device, which comprises a memory, a processor and a computer program stored in the memory and capable of being executed by the processor, wherein the processor realizes the method of any one of the above items when executing the computer program.
The application also discloses a computer-readable storage medium, a non-volatile readable storage medium, having stored therein a computer program which, when executed by a processor, implements the method of any of the above.
The present application also discloses a computer program product comprising computer readable code which, when executed by a computer device, causes the computer device to perform the method of any of the above.
Compared with the prior art, the method has the following beneficial effects:
the device can detect dynamic and static human bodies, and can ensure that the power consumption of the whole machine is lower and the device is suitable for supplying power to disposable batteries (button lithium batteries, columnar lithium batteries, dry batteries and the like).
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
FIG. 1 is a functional block diagram of a system according to one embodiment of the present application;
FIG. 2 is a flow chart of a human detection method according to one embodiment of the present application;
FIG. 3 is a flow chart of a method for human detection with an infrared array thermal sensor according to one embodiment of the present application;
FIG. 4 is a schematic block diagram of a system according to one embodiment of the present application
FIG. 5 is a schematic diagram of a computer device according to one embodiment of the present application; and
FIG. 6 is a schematic diagram of a computer-readable storage medium according to one embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 4, an embodiment of the present application provides a human presence detection method, including:
when the pyroelectric infrared sensor is triggered, outputting a first interrupt signal to the infrared array thermal sensor;
when the infrared array heat sensor detects a heat source signal meeting the human body condition within a first preset time, the infrared array heat sensor outputs a second interrupt signal to the main control circuit;
and the radio frequency communication module of the main control circuit sends the person state information.
In an embodiment of the application, when the infrared array thermal sensor does not detect the heat source signal within a first preset time, the infrared array thermal sensor does not output the second interrupt signal, and determines that the first interrupt signal is a false alarm signal.
In an embodiment of the present application, the radio frequency communication module of the main control circuit is turned off after sending the first state, and the infrared array thermal sensor continues to operate.
In an embodiment of the present application, when the infrared array thermal sensor detects the heat source signal within a second preset time, the above steps are repeated; and when the infrared array heat sensor does not detect the heat source signal within a second preset time, the infrared array heat sensor is closed.
In an embodiment of the present application, after the pyroelectric infrared sensor outputs the first interrupt signal, the method further includes:
the infrared array thermal sensor acquires initial frame temperature data;
marking coordinate information of the maximum temperature value of the current frame, calculating the temperature difference between the temperature value of the dot matrix taking the coordinate information as the center and the maximum temperature, wherein if the temperature difference is greater than a first preset temperature, the infrared array heat sensor does not output, and if the temperature difference is less than the first preset temperature, the infrared array heat sensor outputs a second interrupt signal.
In an embodiment of the present application, the acquiring initial frame temperature data by the infrared array thermal sensor includes:
when a first difference value between the maximum value and the average value in the initial frame temperature data is smaller than a second preset temperature, the infrared array thermal sensor does not output; and when the first difference is greater than the second preset temperature, judging a second difference between the maximum value and the average value of the temperature data of the next continuous n frames, if the second difference is less than the second preset temperature, the infrared array thermal sensor has no output, and if the second difference is greater than the second preset temperature, entering the next judgment process, wherein n is a natural number.
In an embodiment of the present application, there is also provided a human presence detection system, including:
the pyroelectric infrared sensor is used for outputting a first interrupt signal to the infrared array heat sensor when the pyroelectric infrared sensor is triggered;
the detection module is used for outputting a second interrupt signal to the main control circuit by the infrared array heat sensor when the infrared array heat sensor detects a heat source signal meeting human body conditions within first preset time;
and the communication module is used for sending the person state information by the radio frequency communication module of the main control circuit.
For example, the technical solution adopted by the present application to solve the above technical problem is: a two-stage trigger source topological structure is adopted, PIR serves as a first-stage trigger source, an infrared array heat sensor serves as a second-stage trigger source, and the problems are solved through a reasonable detection process.
FIG. 1 is a schematic block diagram of the system of the present application, which includes a Fresnel lens, a digital PIR sensor, an infrared array thermal sensor, a main control circuit, a power management circuit, etc. The main control circuit comprises a microcontroller, a radio frequency communication circuit module and the like, and the power management circuit comprises an LDO module, a disposable battery (button lithium battery, column lithium battery, dry battery and the like) module and the like.
Fig. 2 is a flowchart of a human body detection method of the present application, and the specific detection process is as follows:
under the acquiescence state, the complete machine except that the PIR module all is in standby state, because PIR self low power dissipation (uA level), the complete machine power consumption is lower relatively for disposable battery (button lithium cell, column lithium cell, dry battery etc.) can work longer time.
When PIR is triggered, an interrupt signal is output to awaken the infrared array heat sensor, if the infrared array heat sensor does not detect a heat source signal meeting human body conditions within T1 time, the interrupt signal is not output, the PIR trigger signal is judged to be a false alarm signal, the system does not report a 'person' state, and the system returns to a standby state.
If the infrared array heat sensor detects a heat source signal meeting the human body condition within T1 time, an interrupt signal is output and the main control circuit is awakened to start the radio frequency communication circuit module and report a 'person' state, then the radio frequency communication circuit module is closed to save the electric quantity, but the infrared array heat sensor continues working, and if the infrared array heat sensor detects a heat source signal meeting the human body condition within the following T2 time, a new round of reporting and detecting process is started; if no heat source signal meeting the human body condition is detected, the system returns to the standby state.
Fig. 3 is a flowchart of a human body detection method of the infrared array thermal sensor of the present application, and the specific detection process is as follows:
after the PIR outputs a trigger signal, the infrared array heat sensor is started and obtains initial frame temperature data, and if the difference value between the maximum value and the average value in the initial frame temperature data is smaller than a threshold value t1, the infrared array heat sensor does not output; if the difference value of the maximum value and the average value is larger than the threshold value t1, judging the difference value of the maximum value and the average value of the temperature data of the next 2 continuous frames, if the difference value is smaller than t1, the infrared array thermal sensor does not output, and if the difference value is larger than t1, entering the next judgment flow.
Firstly, marking coordinate information (i, j) of the maximum temperature value of the current frame, and calculating the temperature difference between the temperature value of a 3x3 lattice taking (i, j) as the center and tmax, wherein if the temperature difference is larger than t2, the infrared array thermal sensor has no output, and if the temperature difference is smaller than t2, the infrared array thermal sensor outputs a trigger signal.
It should be noted that the first two judgment conditions in the detection process are used for solving the false alarm problem, the last judgment condition is used for eliminating small-size heat source signals such as a water cup and a teapot, and the 3x3 dot matrix can be adjusted correspondingly according to the actual scene of sensor installation.
The beneficial effect of this application is: the PIR and infrared array heat sensor two-stage triggering source topological structure can effectively solve the problems of false alarm of the PIR sensor caused by environmental factors (air conditioner, natural wind, sunlight and the like) and application limitation only suitable for dynamic human body detection, effectively reduces the power consumption of the whole machine by setting proper T1/T2, and is particularly suitable for the power supply scene of a disposable battery.
The PIR sensor portion of the above-mentioned patent may be replaced by an analog PIR sensor + an amplified comparator circuit + a window comparator, as shown in fig. 4.
Compared with the prior art, the infrared array thermal sensor adopts a two-stage trigger source topological structure, the PIR serves as a first-stage trigger source, and the infrared array thermal sensor serves as a second-stage trigger source;
in the human body detection process of the infrared array heat sensor, false alarm can be effectively avoided and non-human body heat sources (such as teapots, water cups and the like) can be effectively eliminated by setting proper t1/t 2;
in the human body existence detection process of the whole system, the power consumption of the whole system can be effectively reduced by setting proper T1/T2, and the method is suitable for the power supply scene of the disposable battery.
Referring to fig. 5, the present application further provides a computer device including a memory, a processor, and a computer program stored in the memory and executable by the processor, wherein the processor implements the method of any one of the above methods when executing the computer program.
Referring to fig. 6, a computer-readable storage medium, a non-volatile readable storage medium, having stored therein a computer program which, when executed by a processor, implements any of the methods described above.
A computer program product comprising computer readable code which, when executed by a computer device, causes the computer device to perform the method of any of the above.
It will be apparent to those skilled in the art that the modules or steps of the present application described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present application is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A human presence detection method, comprising:
when the pyroelectric infrared sensor is triggered, outputting a first interrupt signal to the infrared array thermal sensor;
when the infrared array heat sensor detects a heat source signal meeting the human body condition within a first preset time, the infrared array heat sensor outputs a second interrupt signal to the main control circuit;
and the radio frequency communication module of the main control circuit sends the person state information.
2. The human presence detecting method according to claim 1, wherein when the infrared array heat sensor does not detect the heat source signal within a first preset time, the infrared array heat sensor does not output the second interrupt signal and determines that the first interrupt signal is a false alarm signal.
3. The human presence detection method according to claim 2, wherein the radio frequency communication module of the main control circuit is turned off after transmitting the first state, and the infrared array thermal sensor continues to operate.
4. The human presence detection method according to claim 3, wherein said step is repeated when said infrared array heat sensor detects said heat source signal within a second predetermined time; and when the infrared array heat sensor does not detect the heat source signal within a second preset time, the infrared array heat sensor is closed.
5. The human presence detection method according to claim 4, further comprising, after the pyroelectric infrared sensor outputs the first interrupt signal:
the infrared array thermal sensor acquires initial frame temperature data;
marking coordinate information of the maximum temperature value of the current frame, calculating the temperature difference between the temperature value of the dot matrix taking the coordinate information as the center and the maximum temperature, wherein if the temperature difference is greater than a first preset temperature, the infrared array heat sensor does not output, and if the temperature difference is less than the first preset temperature, the infrared array heat sensor outputs a second interrupt signal.
6. The human presence detection method according to claim 5, wherein said infrared array thermal sensor acquiring initial frame temperature data comprises:
when a first difference value between the maximum value and the average value in the initial frame temperature data is smaller than a second preset temperature, the infrared array thermal sensor does not output; and when the first difference is greater than the second preset temperature, judging a second difference between the maximum value and the average value of the temperature data of the next continuous n frames, if the second difference is less than the second preset temperature, the infrared array thermal sensor has no output, and if the second difference is greater than the second preset temperature, entering the next judgment process, wherein n is a natural number.
7. A human presence detection system, comprising:
the pyroelectric infrared sensor is used for outputting a first interrupt signal to the infrared array heat sensor when the pyroelectric infrared sensor is triggered;
the detection module is used for outputting a second interrupt signal to the main control circuit by the infrared array heat sensor when the infrared array heat sensor detects a heat source signal meeting human body conditions within first preset time;
and the communication module is used for sending the person state information by the radio frequency communication module of the main control circuit.
8. A computer device comprising a memory, a processor and a computer program stored in the memory and executable by the processor, wherein the processor implements the method of any one of claims 1-6 when executing the computer program.
9. A computer-readable storage medium, a non-transitory readable storage medium, having stored therein a computer program, characterized in that the computer program, when executed by a processor, implements the method according to any one of claims 1-6.
10. A computer program product comprising computer readable code that, when executed by a computer device, causes the computer device to perform the method of any of claims 1-6.
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| CN113485187A (en) * | 2021-07-08 | 2021-10-08 | 南京航空航天大学 | Indoor energy consumption waste monitoring system and monitoring method thereof |
| CN114047552A (en) * | 2021-11-11 | 2022-02-15 | 江西农业大学 | Human body existence sensor |
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Application publication date: 20200515 |